What it means
This shows what happens if you pay more than your normal mortgage payment, either every month or as a one-off.
Owning
Mortgage overpayment calculator
How much interest and time you could save by paying extra.
Why it matters
Extra payments cut the balance sooner, which can save a lot of interest and shorten the years you are in debt.
When to use it
Use it when you have spare cash, a bonus, or room in the monthly budget and want to see if overpaying is worth it.
How to read the result
Interest saved and years cut are the headline. Check your deal for free overpayment limits before you commit large sums.
Your figures
Defaults to a standard repayment for the balance, rate and term.
Methodology
Rules checked against published sources as of 2025-04-01.
- A month-by-month repayment schedule compares your contractual payment with regular and one-off overpayments.
- Interest saved is original total interest minus interest with overpayments.
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FAQs
Will overpaying trigger an early repayment charge?
Some products limit free overpayments each year. This calculator does not model ERCs. Check your offer document.